Gilladian said:
Nobody has mentioned my favorite music - FILK!
The only song I can think of that I like that I know for certain would be considered "filk" is "The Death of Optimus Prime" by
Mr. McFeeley. It's kind of a western-style requiem for old Big Bot.
There's some other stuff that's close, too, but I have reasons for doubting you'd consider it filk:
Steven Cavanaugh does filkish covers of older songs, with the lyrics rewritten to be about Star Wars - like "Darth Maul" to the tune of "When You Say Nothing At All", originally by Keith Whitley - but that may be more parody than filk.
Nitocris performed the song "Darkside" for a Star Wars fan film about Mara Jade, but while incredibly good, its just a little heavy to be what I generally think of as filk.
And
Bentframe is a rap group (yes, I know what you said about rap) that has done a few original raps about Star Wars, and one about the Chipmunks - maybe not filk, but definitely fun, and sci-fi/pop culture related.